Ralph J. Roberts (1911-2007) was an American geologist and research scientist with the USGS. He is credited with the discovery of the Carlin and Battle Mountain Gold Belts, which make up the richest gold-mineral region in Nevada as well as the United States.
In 1960, Roberts published a lengthy paper that predicted the existence of important mineral-bearing rocks in Nevada, . Roberts' research led to the discovery of the Carlin and Cortez-Battle Mountain gold belts. These two mining districts now represent the richest gold region in the United States, and one of the leading gold producing regions of the world.
During the 1970s he spent six years in Saudi Arabia, mapping ore deposits and contributing to the development of the Arabian mining industry. He retired from the USGS in 1981, but continued his mineral exploration in Nevada for over two decades.